repl jack-in.

desktop/src/advent/core/desktop_launcher.clj

@@ -1,10 +1,22 @@
 (ns advent.core.desktop-launcher
-  (:require [advent.core :refer :all])
+  (:require [advent.core :refer :all]
+            [clojure.tools.nrepl.server])
   (:import [com.badlogic.gdx.backends.lwjgl LwjglApplication]
            [org.lwjgl.input Keyboard])
   (:gen-class))
 
+(defmacro start-nrepl-expr [port]
+  `(let [{port# :port} (clojure.tools.nrepl.server/start-server :port ~port)]
+     (doseq [port-file# ["target/repl-port" ".nrepl-port"]]
+       (-> port-file#
+           java.io.File.
+           (doto .deleteOnExit)
+           (spit port#)))
+     (println "Started nREPL server on port" port#)))
+
 (defn -main
-  []
+  [& [port]]
+  (when port (start-nrepl-expr (Integer/parseInt port)))
   (LwjglApplication. advent "advent"  1280 960)
+
   (Keyboard/enableRepeatEvents true))